Abstract

Convective characteristics are analyzed numerically in a rotating multipass square duct connecting with 180-deg sharp returns. Isoflux is applied to each duct wall and periodic conditions are used between the entrance and exit of a typical two-pass module. Emphasis is placed on the phenomenon of buoyancy-driven reversed flow in the serpentine duct. Predictions reveal that the radial distance from the rotational axis to the location of flow separation in the radial-outward duct decreases with increasing the Richardson number. In addition, the local buoyancy that is required to yield the radial flow reversal increases with increasing the rotation number. This buoyancy-driven reversed flow in the radial-outward duct always results in local hot spots in the cooling channels. The critical buoyancy for the initiation of flow reversal is therefore concluded for the design purpose. [S0022-1481(00)01101-4]

Issue Section:
Technical Notes
Keywords:
channel flow, heat transfer, convection, rotating bodies, Coriolis force, Channel Flow, Heat Transfer, Mixed Convection, Periodic, Rotating
Topics:
Buoyancy, Ducts, Flow (Dynamics), Heat transfer, Rotation, Channel flow, Coriolis force, Flow separation, Radial flow
1.
Han
,
J. C.
, and
Zhang
,
Y. M.
,
1992
, “
Effect of Uneven Wall Temperature on Local Heat Transfer in a Rotating Square Channel With Smooth Walls of Radial Outward Flow
,”
Trans. ASME, Ser. C: J. Heat Transfer
,
114
, pp.
850
–
858
.
2.
Wagner
,
J. H.
,
Johnson
,
B. V.
, and
Kopper
,
F. C.
,
1991
, “
Heat Transfer in Rotating Serpentine Passages With Smooth Walls
,”
Trans. ASME J. Turbomachinery
,
113
, pp.
321
–
330
.
3.
Hwang
,
J. J.
, and
Lai
,
D. Y.
,
1998
, “
Three Dimensional Mixed Convection in a Rotating Multiple-Pass Square Channel
,”
Int. J. Heat Mass Transf.
,
41
, pp.
979
–
991
.
4.
Prakash
,
C. V.
, and
Zerkle
,
R.
,
1992
, “
Prediction of Turbulent Flow and Heat Transfer in a Radially Rotating Square Duct
,”
Trans. ASME J. Turbomachinery
,
114
, pp.
835
–
846
.
5.
Dutta
,
S.
,
Andrews
,
M. J.
, and
Han
,
J. C.
,
1996
, “
On Flow Separation With Adverse Rotational Buoyancy
,”
Trans. ASME, Ser. C: J. Heat Transfer
,
118
, pp.
977
–
979
.
6.
Yang
,
W. J.
,
Zhang
,
N.
, and
Chiou
,
J.
,
1992
, “
Local Heat Transfer in a Rotating Serpentine Flow Passage
,”
Trans. ASME, Ser. C: J. Heat Transfer
,
114
, pp.
354
–
361
.
7.
Choi
,
J. M.
,
Anand
,
N. K.
,
Lau
,
S. C.
, and
Kukreja
,
R. T.
,
1996
, “
Heat (Mass) Transfer in a Serpentine Channel with Right-Angled Turns
,”
Trans. ASME, Ser. C: J. Heat Transfer
,
118
, pp.
211
–
213
.
8.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere, Washington, D.C.
9.
Hwang
,
J. J.
, and
Lai
,
D. Y.
,
1998
, “
Three Dimensional Laminar Flow in a Rotating Multiple-Pass Square Channel With 180-deg Turns
,”
Trans. ASME, J. Fluids Eng.
,
120
, pp.
488
–
495
.
10.
Kim
,
N.
,
Anand
,
N. K.
, and
Rhode
,
D. L.
,
1998
, “
A Study on Convergence Criteria for a Simple-Based Finite-Volume Algorithm
,”
Numer. Heat Transfer, B
,
34
, pp.
401
–
417
.
Copyright © 2000
 by ASME
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